102112212121 has 4 divisors (see below), whose sum is σ = 108118812852. Its totient is φ = 96105611392.

The previous prime is 102112212091. The next prime is 102112212133. The reversal of 102112212121 is 121212211201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121212211201 = 1049 ⋅115550249.

It can be written as a sum of positive squares in 2 ways, for example, as 84986825625 + 17125386496 = 291525^2 + 130864^2 .

It is a cyclic number.

It is not a de Polignac number, because 102112212121 - 2¹¹ = 102112210073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102112212095 and 102112212104.

It is not an unprimeable number, because it can be changed into a prime (102112212421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003300340 + ... + 3003300373.

It is an arithmetic number, because the mean of its divisors is an integer number (27029703213).

Almost surely, 2^102112212121 is an apocalyptic number.

It is an amenable number.

102112212121 is a deficient number, since it is larger than the sum of its proper divisors (6006600731).

102112212121 is an equidigital number, since it uses as much as digits as its factorization.

102112212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006600730.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 102112212121 its reverse (121212211201), we get a palindrome (223324423322).

The spelling of 102112212121 in words is "one hundred two billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".